<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>win10开机动画</title>
    <style>
        .con {
            background-color: #000000;
            width: 300px;
            height: 300px;
            position: relative;
        }
        .con>div {
            width: 80px;
            height: 80px;
            position: absolute;
            top: calc(50% - 40px);
            left: calc(50% - 40px );
        }
        .con>div>span {
            position: absolute;
            border-color: black;
            width: 100%;
            height: 100%;
            -webkit-animation: my 6s infinite;
        }
        .con span:after {
            content: '';
            display: block;
            width: 10px;
            height: 10px;
            background-color: #fff;
            border-radius: 0.5rem;
        }

        @keyframes my {
            0% {
                -webkit-transform: rotate(225deg);
                -webkit-animation-timing-function: ease-out ;
                opacity: 1;
            }
            10% {
                -webkit-transform: rotate(360deg);
                -webkit-animation-timing-function: linear;
                opacity: 1;
            }
            30% {
                -webkit-transform: rotate(450deg);
                -webkit-animation-timing-function: ease-in-out;
                opacity: 1;
            }
            50% {
                -webkit-transform: rotate(720deg);
                -webkit-animation-timing-function: linear;
                opacity: 1;
            }
            70% {
                -webkit-transform: rotate(810deg);
                -webkit-animation-timing-function: ease-in;
                opacity: 1;
            }
            80% {
                -webkit-transform: rotate(945deg);
                opacity: 1;
            }
            81% {
                -webkit-transform: rotate(945deg);
                opacity: 0;
            }
            100% {
                -webkit-transform: rotate(945deg);
                opacity: 0;
            }
        }
        .con span:nth-child(1) {
            -webkit-animation-delay: 0.2s;
        }
        .con span:nth-child(2) {
            -webkit-animation-delay: 0.4s;
        }
        .con span:nth-child(3) {
            -webkit-animation-delay: 0.6s;
        }
        .con span:nth-child(4) {
            -webkit-animation-delay: 0.8s;
        }
        .con span:nth-child(5) {
            -webkit-animation-delay: 1.0s;
        }
    </style>
</head>
<body>
<div class="con">
    <div>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
        <span></span>
    </div>
</div>
</body>
</html>